Electric-arc lamp.



PATENTED JULY 28, 1903.

F. W. GORE. ELECTRIC ARC LAMP.

APPLICATION FILED MAY 24, 1902.

2 SHEETS-SHEET 1.

NO MODEL.

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ELECTRIC ARC LAMP.

APPLICATION FILED MAY 24, 1902.

N0 MODEL. 2 SHBBTS-SHEET 2- Wirnegses:

UNITED STATES Patented d'uly 28, 1908.

FREDERICK W. GORE, OF DORCHESTER, MASSACHUSETTS.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 734,699, dated July 28, 1908. Application filed May 24,1902. Serial No. 108,758. (No modeld To all whom it may concern:

Be it known that I, FREDERICK W. GORE, a citizen of the United States, residing at Dorchester, in the county of Sufiolk and State of Massachusetts,haveinvented certain newand useful Improvements in Arc-Lamps, of which the following is a specification.

This invention relates to arc-lamps, and

has for its object to provide a device of the class described which will possess points of advantage in convenience, simplicity, inexpensiveness, effectiveness, and general efficiency.

My improvements include certain arrangements in which air-pressure is used to prevent jerky and irregular movement'of the carbons, feeding devices therefor, and certain other details of construction and combinations of parts, all of which will now be particularly described and the novel features pointed out in the claims.

In the drawings, Figure 1 is a vertical View of an arc-lamp embodying my improvements, partly in section and partly in elevation. Fig. 2 is an enlarged view of the lower part of the lamp, showing parts in section, parts in dotted lines, and parts broken away. Fig. 3 is a plan view of the top of the lamp. Fig. 4 is a sectional view on the line t a, Fig. 1. Fig. 5 is a sectional View on the line 00, Fig. 2. Fig. 6 is a sectional view on the line (1 d, Fig. 2.

Corresponding parts in all the figures are denoted by the same reference characters.

Referring to the drawings, 1 designates an electric-arc lamp provided with a top 2, in which an eyebolt '3 is threaded, by means of which eyebolt 3 the lamp 1 may be suspended. A U-shaped frame, made up of cross-bar4 and the side members 5, which latter are tubular, has its upper ends threaded in the top 2. A cylindrical casing 6 is secured to the top 2 and is provided at its lower end with an annular enlargement 7,in the'depending sides 8 of which enlargement 7 set-screws 9 work. A globe 10 has its upper end secured'in said enlargement by the set-screws 9. The globe 10 is provided at the bottom with an opening in which a cup-shaped member 11 is secured. An insulating porcelain frame 12 is secured about the upper part of the side members 5 of the frame 4 and a resistance-coil 13 is arrangedaround the porcelain insulating-frame 12. Secured at its upper end centrallyin the lower part of the top 2 is a cylindrical casing 14, having a closed top and an open bottom, provided at its upper end with an aperture foradmitting air, in which chamber the upper carbon-carrier is adapted toslide. The carbon-carrier 15 is provided with a piston-like head 15, which fits in. thechamber 14 substantially airftight, so that when the carbon-carrier 15 descends the head 15 draws a ball 14 against the aperture, by which air is admitted to the chamber 14 and prevents the ingress of air,thereby causinga vacuum above the head 15 and causing the carrier 15 to descendisteadily and slowly and without jerks. A suitable holder 16 is secured upon the base of the frame 4, and a lamp-globe 17 has its lower end secured in the holder 16. Slidably mounted in the holder 16 and the bar 4 is a frame 18, provided at the top with means of holding the lower carbon 19. Secured at its upper end in the lower part of the bar 4 is a chamber 20, into which air is admitted through a small aperture 21, normally closed by a ball 21*. Secured upon the base of the frame 18 and extending up into the chamber '20 is a stem 22, provided with a head 23,

which fits the chamber 20 substantially airtight. When the frame 18 descends, the'head 23 draws the ball 21 against the aperture 21 and prevents the ingress of air into the chamber 20, thereby causing the frame 18 to descend slowly, steadily, and without jerks. A rod 24 is adjustably and pivotally secured at one end to an extension at the lower end of one of the side members 5 of the frame 4. As here shown, the rod 24 has its end bifurcated and provided with registering perforations in such bifurcation and straddles the extension 5 of the side member 5, which'is provided with a series of perforations, in one of which the end of the rod 24 may be pivoted by pass ing a pin through the perforations. The rod 24 extends across the frame 18 and engages with an adjustable stop member 25, secured on the frame 18, as seen in Fig. 1. The other end of the rod 24 is similarly bifurcated and perforated and pivotally secured to the lower end of a rod 26, which extends up into the tubular side member 5 of the frame 4. Near the upper end of the rod 26 one end of a clutch 27 is pivotally secured, and the upper end of the rod 26 is secured to the lower end of a spring 28, housed in the tubular member 5 and which is adjustable therein by means of a pin 27 and a slot 5 provided at its sides with notches cut in the tubular member 5. The clutch 27 is composed of insulating material and has one end pivotally mounted upon one of the tubular members 5 and the other end, as has been said, pivotally connected with the rod 26. The clutch 27 is provided centrally with a steel plate 27 and on its lower side, near the end connected with the rod 26, with a soft-iron plate 27 Suitably supported in juxtaposition to the softiron plate 27 is an electromagnet 29, and connected-With the magnet 29 is wire 30, which passes through a binding-block 30 and is connected with a rod 31, which extends up within the casing 6 and has its upper end secured in the top 2. A contact-piece 31 is adjustably mounted on the rod 31 in contact with a resistance-coil l3, bound around the porcelain insulating-frame 12. Another wire 32 leads from the magnet 29 through the bindingblock 30 and the binding-block 33 to the upper carbon 34. A wire connected with the lower carbon 19 is connected with a wire 35, which is carried through one of the tubular side members 5 to the negative binding-post 36 and provided at a suitable distance below the chamber 14 with a projection 35, which extends through a slot on the inner side of the tubular member 5. Positive and negative binding-posts 36 and 36, respectively, are connected with in sulating-plates and respectively embedded in the porcelain frame 12. A lowresistance coil 38 is mounted upon a bracket 39, secured to the tubular member 5 beneath the projection 35. Pivotally mounted on the top of the resistance-coil 38 is a V-shaped arm 40, one member of which extends under the chamber 14 and is adapted to be pressed down by the contact-piece 41, connected with the carbon-carrier 15, and when so pressed down to elevate the other member of the V-shaped arm 40 into contact with the projection 35. The arm 40 is normally held out of contact with the projection 35 by a spring 40.

The operation and advantages of my device will be readily understood and appreciated by persons familiar with the art. The positive wire leading from a source of electric supply (not shown) is connected with the positive binding-post 36 and similarly the negative wire is connected With the binding-post 36. The current on entering the lamp passes through the resistance-coil13 to the contactpiece 31, whence it passes to the magnet 29, which it energizes and which then attracts the clutch 27, drawing it down. This acts to lower the arm 24, and consequently releases I the frame 18, supporting the lower carbon 19, whereupon the combined weight of the lower carbon 19 and frame 18 causes the whole to fall; but on account of the pressure exerted by the air in the chamber 20 the descent of the carbon 19 is even and without jerks. The clutch 27 meanwhile prevents the descent of the upper carbon 34. As the carbons are consumed the current weakens, causing the magnet 29 to have less attractive force until the spring 28 overcomes the attraction of the magnet 29 and draws the clutch 27 to its normal position, carrying with the clutch 27 through the rod 26 the rod 24, and thereby raising the frame 18 and the lower carbon 19. The raising of the clutch at the same time releases the upper carbon 34, which thereupon descends; but owing to the pressure of the air in the chamber 14 the descent is even and slow. When the carbons approach each other sufficiently near,the currentincreasesin magnetic force and the operation above described is repeated.

In case the carbons are broken the low-resistance coil 38 is provided so that the upper carbon 34, having no means of support, will fall by means of gravity until the contactpiece 41 comes in contact with one arm of the V-shaped arm 40, which descends and brings the other arm of the V-shaped arm 40 into connection with the wire 35, connecting with the negative binding-post 36.

The proper tension for the return of the clutch 27 and arm 24 is secured by means of the notched-sided slot 5*, by means of which and a pin adapted to rest on said notches the spring 28 may be suitably tensioned. Similarly the arm 24 is adjustably connected at each end by means of which the proper drop may be provided for the lower carbon 19.

When the clutch 27 descends, carrying the pivoted rod 24 away from the adjustable pin 25, it causes the said rod 24 to descend lower than the final resting-point of the pin 25, so that the fluctuation of the current will not cause the rod 24 to come in contact with the pin 25, and thereby raise the lower carbon. The rod 24 comes in contact With the pin 25,and raises the frame 18 and the carbon-carrier 22 to the normal position,when the current is shut off entirely. Previous to this the upper carbon is tending to close the space established by the falling away of the lower carbon when the current is first thrown on; but on account of the magnet 29 the movement of the upper carbon descends to within the prescribed adjustment,the clutch 27 acts, the descent of the carbon ceases, the normal arc continues until the space between the carbons is again increased, when the same action is repeated. The separation of the pin 25 and pivoted rod 24 allows the lower carbon 19 to fall a little, thus separating the carbons and starting the arc.

I do not desire to be understood as limiting myself to the details of construction and arrangement as herein described and illustrated, as it is manifest that variation and modification may be made in the features of construction and arrangement in the adaptation of the device to various conditions of use without departing from the spirit and.

scope of my invention and improvements. I therefore reserve the right to all such variation and modification as properly fall within the scope of my invention and the terms of the following claims.

Having thus described my invention, I claim and desire to secure by Letters Patent- 1. In an arc-lamp, open-ended air-chambers secured at the top and bottom of said lamp, carbon-carriers slidably mounted in said chambers and means for preventing the ingress of air into said chambers above said carbon-carriers whereby the descent of said carbon-carriers is made even and slow.

2. In an arc-lamp, air-chambers having their lower ends open and their tops closed except for an air-inlet and secured at the top and bottom of said lamp, carbon-carriers provided with heads fitting tightly in said chambers, and means for controlling the ingress of air'to said chambers above said head to prevent the rapid and uneven descent of said carbon-carriers.

3. In an arc-lamp, air-chambers having their lower ends open and their tops closed except for an air-inlet and secured at the top and bottom of the lamp respectively, carbon carriers provided With heads fitting tightly in said chambers, means for controlling the ingress of air to said chambers above said heads to prevent the rapid and uneven descent of said carriers, and an electrically-' controlled clutch operatively connected with the lower carbon and adapted to support the upper carbon. 7

4. In an arc-lamp, air-chambers having their lower ends open and their tops closed except for an air-inlet and secured at the top and bottom of the lamp respectively, carboncarriers provided with heads fitting tightly in said chambers, means for controlling the ingress of air to said chambers above said heads to prevent the rapid and uneven descent of said carriers, and a clutch controlled by the electric-lighting current and operatively connected with the lower carbon and adapted to support the upper carbon.

In testimony whereof I have signed my name in the presence of the subscribing witnesses.

FREDERICK W. GORE. Witnesses:

ALICE A. GORE, A. E. GORE. 

